Improvement in chairs



JACQB MORRISON.

Improvement in Chairs.

117,915. Patented August 8, 1871.

Wifn'esses.

UNITED STATEs PATENT OEEIoE.

JACOB MORRISON, OF INDIANAPOLIS, INDIANA, ASSIGNOR TO HIMSELF AND CALVINA. ELLIOTT, OF SAME PLACE.

IMPROVEMEN T IN CHAIRS.

To all whom it may concern:

Be it known that I, JAooB MonRIsoN, of Indianapolis, in the county ofMarion and State of Indiana, have invented a new and useful Improvementin Chairs, and I do hereby declare that the following is a full, clear,and exact description of the construction and operation of the same,reference being had to the accompanying drawing making a part of thisspecification, in Which Figure 1 is a vertical sectional view asindicated by the line 00 m. Fig. 2 is a view of the under side of chair,showing spring and arm devices.

Like letters in both figures of the drawing indicate like parts.

My invention consists of an adjustable and yielding back arranged tomove in the arc of a circle through sockets or other equivalent bearingsin the seat of the chair by means of arms pivoted to the under side ofthe seat, and constructed so as to embrace firmly the lower ends of thestandards of the back, in combination With springs suitably arranged togive the back the necessary yielding movement, the downward movement ofthe back being regulated by its bottom rail being placed at a suitabledistance above the top of the seat; the object of the invention being tomake the back adjust itself more perfectly to the back of the personwithout producingany uncomfortable feeling thereon.

A is the seat; B, the back; 0, the arms; and D, the springs. As the backis designed to move in the arc of a circle from an axis fixed in thecenter of the seat, it follows, therefore, that the shape of the lowerpart of the standards of the back should be made to that curve, in orderthat they may work properly in the sockets to o f the. seat, the socketsconsisting of etaili boxes set in mortises made in t he wat to receivethem, and corresponding in shape with that part of arms 0 are providedwith sockets b, or constructed so as to embrace the bottom ends of thestandards of the back and fastened thereto by screws. The opposite endsof the arms are attached by pivot-screws c to the under side of theseat, in such a manner as to allow the back to move in the arc of acircle. Thus the person, when seated and leaning back, depresses theback of the chair down in the line of that curve, bringing it in acomfortable position to support the back, and when leaning forward, thesprings D bearing upon the bottom ends of the standards of the back willcause it to rise upward and adjust itself comfortably to the back of theperson in that position. These springs are attached by screws to theunder side of the seat alongside of the arms, and arranged to bear uponthe bottom ends of the standards of the back, as above described. Thedownward movement of the back is regulated by its bottom rail d beingplaced at a suitable distance above the top of the seat, so that, whenpressed down by the reclining of the person against it, the rail willcome square upon the seat, and, of course, prevent its going anyfurther.

Having thus fully described my invention, what I claim therein as new,and desire to secure by Letters Patent, is

1. The adjustable back of a chair, arranged to move in the arc of acircle through sockets in the seat thereof by means of pivotal arms 0and springs D, substantially as shown and for the purpose set forth.

2. The construction and arrangement of the adjustable back B, rail d,seat A provided with metallic sockets or, arms G, and springs D, all-substantiallynasshown. and described.

JAGOBMORRISON. Witnesses:

SAML. G. VANCE,

the standards of the back just described. The

G. B. ToWLEs.

